Abstract
In this article, an attempt has been made to evaluate the effect of hot corrosion due to potassium sulfate and sodium chloride mixture on creep rupture of induction pressure welded (IPW) 2.25 Cr-1Mo steel. Based on the results obtained from creep and hot corrosion tests at 550 and 600 C, the following conclusions are drawn: (1) The coating of 40% K[sub 2]SO[sub 4] - 60% NaCl led to lowering of rupture life of the material. (2) Coated samples showed localized oxidation and sulfidation along the grain boundary thereby weakening it. The enhanced oxidation due to the coating was attributed to continuous supply of oxygen to the metal through the liquid phase of salt coating. (3) Scale failure occurs due to the development of stress on the scale on continuous reaction of salt coating with the base metal. (4) Once the scale spalled off, fresh metal is exposed for further attack leading to early failure.
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